Drawing mechanism



Mar. 13, 1923. 1,448,191

A. C. BUTLER DRAWING MECHANI SM Filed Sept. 15: 1920 J Y Ezwzi r rfizza' 'awizr l; J 1J1 QT,

Patented Mar. 13, 1923.

UNITED STATES 1,448,191 PATENT OFFICE.

ARTHUR CECIL BUTLER, 015 BOSTON, MASSACHUSETTS.

DRAWING MECHANISM.

Application filed September 15, 1920., Serial No. 410,373.

To all whom it may concern:

Be it known that I, ARTHUR CECIL.

BUTLER, a subject of the King of Great Britain, and residing at Boston, in the county of 'Sufi'olkand State of Massachu In the drawing mechanism of such instrumentalities, the roving is passed between 1 .separated pairs of rolls which are set apart a distance greater than the length of an individual fiber, and the rolls of the several pairs are rotated at increasing speeds, in, the direction of travel of the roving, so as to draw out the fibers and elongate the roving. The fibers, which comprise the roving, are of different lengths, and it frequently occurs in the ordinary draft mechanism that the yarn is delivered in an uneven and bunchy condition, this being caused to some extent by the longer fibers drawing along with them some of the shorter fibe'rsso that the draft is uneven.

According to the present invention, I employ devices located between the nip of the adjacent pairs of rollsfor the purpose of engaging the roving and exerting a certain frictional resistance to the travel thereto so as to ensure the elongation or drawing out of the roving smoothly and without permitting the roving tobecome uneven; that is, without the formation of thick and thin spots in the roving. Between the adjacent pairs of rolls, the roving is supported during a portion of its travel, and a welght or member is caused to rest by gravity on the roving, such membert'being referably so formed as to condense the roving prior to its being engaged by the nip of the second pair of the rolls.

On the accompanying drawing, I have illustrated several different forms of draft or drawing mechanism embodying the invention.

F i re 1 represents more or less conventiona y, and in longitudinal section, a portion of the drawing mechanismof a spinning frame, in which mechanismil employ a belt for'supporting the roving between the intermediate and front rolls.

In Figure 2, I have illustrated, in similar section, a drawing mechanism in which belts and weighted members are employed betweenthe back and intermediate rolls and between the intermediate andthe front rolls.

Figure 3 represents a similar section of a somewhat different construction in which the lower roll of the intermediate rolls performs the function of a belt.

Figure 4 is a similar section in which the lower roll of the back rolls is utilized for supporting the roving, as well as the lower 7 roll of the intermediate 'rolls.

Figure 5 represents in plan view the drawing mechanism shown in Figure 1.

Figure 6 represents the same mechanism in side elevation as applied to a spinning frame. v

t Figure 7 illustrates one of the gravity members or plates.

On the drawings, a roller stand is illustrated at 10, upon which the pairs of rolls are supported and on which they may be adjusted towards and from each other. The particular manner in which the various rolls may be mounted is not material. In Figure l, 11 and 12 indicate the back rolls, 13 and 14 the intermediate rolls, and 15 and16 the front rolls. These rolls may have any suitable or usual construction. I have not illustrated the cap bars by which the upper rolls of the pairs are kept in place, as this is a well known feature of the drawing mechanism, but obviously the top rolls of the several pairs should be adjustable. with the lower rolls of the same pairs. As indicated, however, the rolls 12 and 14 are journaled in blocks or brackets 17, 18, respectively. l9 and 20 indicate traverse bars which are reciprocated automatically by the usual traverse motion which it is unnecessary to illustrate. Each of these traverse bars is provided with a series of condensing guidesor apertures 21, 22, through which the rovings pass to the nip of the rolls to which they are delivered. I

My present improvement, as embodied in Figure 1, comprises a belt 23 which passes around the lower roll 14 of the intermediate pair of rolls, thence over a small guide roll 24 located loosely in the endof a bar 25 supported by the bracket 18, and thence, around a take-up roll 26 which rests loosely upon the lower stretch of thebelt or band, and normally rests against an angle bar 27 also affixed to the bracket or block. 18. This,

, and 14,'each beltor band'being driven by its associated'roll 14. Between the intermediate and the front .rolls, I locate a loosely hung weight or gravity member which is in the form of a plate and adapted torest loosely upon the roving which'is supported by the belt or band 23. In the form shown in Figure 1, the end of the plate, which is indicated at 29, is projected beyond the guide roll 24 and is formed with a condensing guide or eye 30 which is located relatively cl'ose'to thenip of the rolls 15 and 16. This eye may be formed, as in Figure 7, by bending the end of the plate so as to form' an open groove or slot of such shape that the roving is condensed as it passes therethrough. I regard it as important to provide the plate with a condenser irrespective of the form thereof.

In order that the plate may rest loosely upon the roving by gravity, it is provided 'with suitable means by which it is loosely attached tosome portion of the mechanism, so that it is free to move up and down and yet is held against movement longitudinal of the path of movement of the roving. This may be accomplished in various 'ways, but I preferably connect it to the traverse bar so that it will move therewith. For example, each plate may be provided with rearwardly extending arms 31 which straddle the boss of the top roll 13, and which at their rear ends are engaged with the traverse bar 20. The said bar 20 may be notched on its upper edge and the ends'of the arms 81 may engage the notches and be turned down so that their bent extremities will engage the rear face of the bar as shown in Figure 7. In lieu of this attachment," however, it will be understood that the plate 29'may be attached to the traverse bar or to any other portion of the roll stand or draft mechanism so' as to permit it to perform its function;

From this description, it is quite apparent that, when the drawinginechanism is in operation, the roving, in passing between the intermediate rolls and front rolls, is supported by a-belt orband, and that the gravitymember or plate 29 rests loosely upon the rovingso that the roving is lightly but frictionallfy gripped between them for a substantial distance. The under 'face of the plate is preferably smooth so as not to unthan has heretofore'beeii possible.

duly increase the frictional resistance to the passage of the roving; By reason of this construction, I am able to secure a much greater draft and amore even roving That is to, say, Imam able greatly to increase the speed of the front rolls in relation to the speed of the intermediate rolls, and thus greatly to elongate or draw out the roving, and at the same time to prevent the formation of uneven spots in the roving.

It is quite evident, of course, that, instead of employing-only one band and its cooperating plate between the intermediate and the front rolls, as illustrated in Figure 1, 1 may locatea similar belt and plate between the rear and intermediate rolls as shown in Figure 2. Inthis case, the lower roll 121 of-the rear rolls-is enlarged, and is provided with aband 231, anda'ssociated with the belt there is the gravity member 291 which is hung upon the traverse bar-19t By duplicating the belts and the plates or gravity members, it is possible to still further increase the draft or drawing out of the roving. I

It is not necessary to use a belt, if its equivalent be employed, For instance, I have illustrated in Figure 3 a construction in which one of the lower rolls also per forms the function of the belt. In this case, the lower roll, which is indicated at 1 .91, is so mounted that its axis is slightly in advance of the axis of its co-actin'g. top roll 131, so'that, duringitstravel-between the nip of the rolls 131, 141, and the nip of the front rolls 15', 16, the roving is supported for the greater part of-its travel upon the periphery of the rolll'tl; In this case, the plate or gravity'member 292' is curved or concave so that a portion of itsunder surfface' is substantially concentric with the axis of the' r'ol l 1 11. In the construction cooperates with the plate or'gravity" member to afford a support for the rovingand at the same time offers a frictionah resistance to the tra vel of the roving.

In Figure #1, I have shown howvtheback rolls may be so arranged-r that the lower roll may have a' ravitymember or plate 294 tocooperate therewith. Where a plate or gravlty member is associated with the rear rolls, as in Figures 2' and t, the middle roving guide or traverse bar 20' neednotbe provided with condensing eyes oraper-tures, and is unnecessary except for the purpose of aifording a means for'h'olding the gravity plates in position and of efiectin'g' the desired traverse thereof.

' IiHB'FlgUI'G G, I have shown theroll stand; having a drawing mechanism embodying the present invention, as beingil'ocated upon a spinning frame merely for the purpose of illustrating one instrumentality in which the drawing mechanism may be employed.

In all of the figures of the drawing, each of the plates or gravity members terminates in relatively close proximity to the nip of the next succeeding pair of rolls, and in each case such plate or gravity member is provided with a condensing or concentratin guide or eye for the purpose stated.

fiach plate is shown as thickened to localize its weight, and is loosely hung at its rear end on a traverse bar, so as to reciprocate laterally therewith. In those forms of my mechanism in which the movable support for the roving is formed by an endless belt or band, the upper stretch of the latter is prevented from sagging by the bar 25 across which it travels.

What I claim is 1. In a drawing mechanism for rovings, a plate arranged to rest loosely by gravity on the roving between the ni s of adjacent pairs of rolls, and means for aterally traversing said late.

2. In the rawing mechanism for rovings, the combination with two pairs of drawing rolls, a plate arranged to rest loosely by gravity on the roving between the nips of the pairs of rolls, and a traverse bar to which the rear end of the plate is hung to move therewith.

8. In the drawing mechanism for rovings, the combination with two pairs of drawing rolls, a plate arranged to rest loosely by gravity on the roving between the nips of th pairs of rolls, and a traverse bar to which the rear end of the plate is hung to mov therewith, the front end of said plate being provided with a condenser guide located in proximity to the nip of the adjacent pair of rolls.

4. In a drawing mechanism, the combination with a palr of drawing rolls, and movable means for feeding and supporting a roving during its travel to the nip of said rolls, and a gravity plate of variable thickness to rest throughout a substantial distance on the roving While it is so supported.

5. In a drawing mechanism, the combination of two pairs of drawing rolls, an endless band on the lower roll of one of said pairs and having a portion extending towardthe other pair to support the roving in its passage between the rolls, and a plate coacting therewith and resting by gravity thereon over a substantial distance so as to coact therewith in frictionally engaging the rov1ng. Y

6. In a drawing mechanism, the combination of two pairs of drawing rolls, an endless band on the lower roll of one of said pairs and having a portion extending between the rolls, a plate coacting therewith and resting by gravity thereon so as to coact therewith in frictionally engaging the roving, and a traversing member to which said plate is loosely attached.

7. In a drawing mechanism the combination of two pairs of drawing rolls, a supporting member positioned between the nips of said pairs of rolls, a guide roller at one end of said member, an endless band on the lower roll of one of said pairs extending over said member and about said guide roller, and a plate arranged to engage a roving supported by said band and passing between the nips of said pairs of rolls.

8. In a drawing mechanism the combination of two pairs of drawing rolls, a supporting member positioned between the nips of said pairs of rolls, a guide roller at one end of said member, an endless band on the lower roll of one of said pairs extending over said member and about said guide roller, and a plate of variable thickness arranged to engage a roving supported by said band and passing between the nips of said pairs of rolls.

9. In a drawing mechanism, the combination of two pairs of drawing members, comprising top rolls and cooperating bottom rolls, a loosely hinged gravity cap resting on the roving between the nips of said rolls, and a traverse bar for causing a traversing movement of said cap.

In testimony whereof I have aflixed my signature.

ARTHUR CECIL BUTLER. 

